jtag: move in interface.h the adapter_driver's declaration
The static analyser 'sparse' complains, while compiling a jtag
driver, that the struct adapter_driver is declared in the file as
non static, but it is not exposed through an include file.
The message is:
warning: symbol 'XXX' was not declared. Should it be static?
Move the list of adapter_driver's declaration in interface.h
Drop the preprocessor #ifdef/#endif around the declaration, as it
has no effect when the declaration is not used and/or the symbol
does not exist.
Change-Id: I5b8f5fe48a89ff0ffce38d547c551cd196379fbf
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7665
Tested-by: jenkins